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Old 10-14-2005, 05:49 AM
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That is basically due to anomalous expansion of water. Unlike other liquids which expand on heating and contract on cooling, water expands on cooling below 4 degree C. This behaviour is known as anomalous expansion of water and as brainy said, it causes the glass to crack and rocks to weather.
(@ @)

The Newtons and friends were taking tea
Beneath the boughs of an apple tree,
When a falling fruit landed on the
Head of the head of the family.
Mrs. Newton cried, 'Well deary me!
That could've caused an injury'.
But clever Isaac alone could see,
The situation's true gravity.

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